Three follow-ups from the code-quality review pass on P0-1:
- Re-export `IngestItemKind` from `kb-core` so downstream tasks
constructing `IngestItem` don't need `kb_core::ingest::IngestItemKind`.
- Document the `--json` wire-schema convention by introducing
`kb-cli/src/wire.rs` with `wire_*` helpers paralleling the existing
inline `wire_ingest`. Each Ok-path `--json` branch now routes through
these helpers so future P1-5/P3/P4/P5 implementations slot the
`schema_version` envelope in automatically. `DoctorReport` keeps its
struct-field `schema_version` (the documented exception), and the
helper round-trips it idempotently. Records the convention in
`kb-app/src/lib.rs`'s top docstring.
- Fix clippy `single_char_add_str` in `kb_core::normalize` (replace
`out.push_str(".")` with `out.push('.')`).
Verified: `cargo check`, `cargo test` (5 new wire-helper tests),
`cargo clippy -D warnings`, and `RUSTFLAGS=-D warnings cargo build` all
clean. Smoke-tested `kb doctor --json` still emits
`{"schema_version":"doctor.v1",...}`.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>